import { VantComponent } from '../common/component';
VantComponent({
    classes: ['title-class', 'content-class'],
    relation: {
        name: 'collapse',
        type: 'ancestor',
        current: 'collapse-item'
    },
    props: {
        name: null,
        title: null,
        value: null,
        icon: String,
        label: String,
        disabled: Boolean,
        clickable: Boolean,
        border: {
            type: Boolean,
            value: true
        },
        isLink: {
            type: Boolean,
            value: true
        }
    },
    data: {
        expanded: false
    },
    created() {
        this.animation = wx.createAnimation({
            duration: 0,
            timingFunction: 'ease-in-out'
        });
    },
    mounted() {
        this.updateExpanded();
        this.inited = true;
    },
    methods: {
        updateExpanded() {
            if (!this.parent) {
                return Promise.resolve();
            }
            const { value, accordion } = this.parent.data;
            const { children = [] } = this.parent;
            const { name } = this.data;
            const index = children.indexOf(this);
            const currentName = name == null ? index : name;
            const expanded = accordion
                ? value === currentName
                : (value || []).some((name) => name === currentName);
            if (expanded !== this.data.expanded) {
                this.updateStyle(expanded);
            }
            this.setData({ index, expanded });
        },
        updateStyle(expanded) {
            const { inited } = this;
            this.getRect('.van-collapse-item__content')
                .then((rect) => rect.height)
                .then((height) => {
                const { animation } = this;
                if (expanded) {
                    animation
                        .height(height)
                        .top(1)
                        .step({
                        duration: inited ? 300 : 1
                    })
                        .height('auto')
                        .step();
                    this.setData({
                        animation: animation.export()
                    });
                    return;
                }
                animation
                    .height(height)
                    .top(0)
                    .step({ duration: 1 })
                    .height(0)
                    .step({
                    duration: 300
                });
                this.setData({
                    animation: animation.export()
                });
            });
        },
        onClick() {
            if (this.data.disabled) {
                return;
            }
            const { name, expanded } = this.data;
            const index = this.parent.children.indexOf(this);
            const currentName = name == null ? index : name;
            this.parent.switch(currentName, !expanded);
        }
    }
});
